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Title: NEOWISE-R observation of the coolest known brown dwarf

The Wide-field Infrared Survey Explorer (WISE) spacecraft has been reactivated as NEOWISE-R to characterize and search for near-Earth objects. The brown dwarf WISE J085510.83–071442.5 has now been re-observed by NEOWISE-R, and we confirm the results of Luhman, who found a very low effective temperature (≈250 K), a very high proper motion (8.''1 ± 0.''1 yr{sup –1}), and a large parallax (454 ± 45 mas). The large proper motion has separated the brown dwarf from the background sources that influenced the 2010 WISE data, allowing a measurement of a very red WISE color of W1 – W2 >3.9 mag. A re-analysis of the 2010 WISE astrometry using only the W2 band, combined with the new NEOWISE-R 2014 position, gives an improved parallax of 448 ± 33 mas and a proper motion of 8.''08 ± 0.''05 yr{sup –1}. These are all consistent with values from Luhman.
Authors:
 [1] ; ; ;  [2] ; ; ; ; ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. UCLA Astronomy, P.O. Box 951547, Los Angeles, CA 90095-1547 (United States)
  2. Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)
  3. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606-3328 (United States)
  5. Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
  6. Planetary Science Institute, Tucson, AZ 85719 (United States)
Publication Date:
OSTI Identifier:
22342235
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; DATA; DWARF STARS; INFRARED SURVEYS; MASS; PROPER MOTION; STARS